Spatial and temporal control of ice formation under microscope
When an external force is loaded on a supercooled water, it is known that ice formation is initiated. Femtosecond laser-induced impulsive force was applied as the external force. We made a supercooled water holder for microscope, to which the femtosecond laser was introduced, and observed behavior of the ice formation by high-speed imaging. We found the ice formation is initiated in the vicinity of the laser focal point just after the laser irradiation. This is new way to realize precise control of ice formation under microscope.
＜Figure 1＞High-speed images of the laser-induced ice formation. Time after the laser irradiation is indicated at the bottom of each image. Black dot at the center of image is laser focal point.
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